The phrase "assault backed" is not correct and does not convey a clear meaning in written English.
It may be intended to describe something that is supported or reinforced by an assault, but the phrasing is awkward and unclear.
Example: "The report indicated that the claims were assault backed, but further evidence was needed to substantiate them."
Alternatives: "supported by an assault" or "reinforced by an attack".
Isis may have to defend Raqqa and, sometime later, Mosul from ground assault backed by massive air raids.
The attackers moved on all three entrances at once in an apparently coordinated assault, backed by truck-mounted artillery.
Porre instead launches an assault, backed by King Zeal and Dalton, placed in Porre's high command by the king.
Isis forces in fixed and identifiable positions cannot withstand ground assaults backed with intense air attacks by the US Air Force or, in the case of the Syrian army, by the Russians.
Iraqi government forces have been trying to retake Tikrit, which is 100 miles north of Baghdad and was overrun by ISIS on June 12, for two and a half weeks, launching a number of assaults backed by armored vehicles and helicopter gunships.
Grant, after his frightful losses in the tangled thickets of the Wilderness and under assault back home in Washington, "turned southward to flank Lee's right rather than retreating in the face of bloody casualties" as had his predecessors.
Mr. Vinegrad, for example, tackled a suggestion by Mr. Fischetti that the jurors should disregard the testimony of a main prosecution witness, Eric Turetzky, the first police officer who came forward with information about the assault back in 1997.
The garrison managed to push the assault back, thus gaining time to repair the walls.
Or Ben Roethlisberger, who was accused of sexual assault back in 2010.
I had my arm broken with an iron pipe in a French Quarter assault, back in 2002.
The U.S. Supreme Court has even endorsed the deportation of a Somalian refugee, convicted of assault, back to Somalia, where no formal government exists.
